Resurfacing tool



June 7, 1949.

Filed March 7, 1.945

J. EL GILES RESURFACING TooL 2 SheebS-Sheef. 1

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Patented `lune 7, 1949 Uliii'i'h@ S'EATES@ PATENT OFFICE RESURFACINGToon John E; Giles, DiabloxHeights, (l: Z..

Application March 7, 1945, Serial N. 581,381

6` Claims. (Oli Sil-4i l. This invention relatesA to" a tool fortrimming or re-facing the seat at the margin of a noncireular opening.Illustration of suchy openings are the' elliptical hand:4 holes inboilers, Stills, e'conomiz'er headers and other containers. Suchelliptical openings are closed in use by a correspondingly shapedclosure member passed from' the exterior' to the inside' of the vessel'and causedI by external mear'is'toV seat on the inner margin of th'eopening' or' on an interposed gasket bearing against such margin. Henceit isA important that this inner margin about the' opening be smooth, tom'akea proper seat for the gasket or closure.

In use such marginal seats are liable to become worn or pitted so thatleakage' results. In the past When this" condition arose the entiredevice or section has been replaced, at a considerable expense and lossof time, or the seat has been repaired by welding material' over theeroded portions and2 grinding oi the excess of the Weld by han-d, or' byapplying lli'ng compounds to the grooves and' depressions. Neither ofthese methods of repair has been satisfactory, or resulted in a smoothseat'. On the other hand, it has been. Very'difiieu'lt, with anyexisting tools, to machine the seat on account of its peculiar shape andinaccessibility. l

It is the general object of my invention to provide' an eliicient toolwhich may be mounted in the opening and operated from the exterior tomachine' accurately the seat on the inside.

Another' object is tol provide such a tool car.- ryin'g a trimming bitso controlled that it may movel in a path corresponding to the contourof the opening and act against the margin to produce a perfectly smoothseat.

My invention includes means for properly positioiiih'gf the toolin theopening, and for clamping' it' iii place, andE means for then causingthe cutting bit on the interior to travel in a course corresporidrigtothe Shape of the opening While being suitably pressed against thesurface to effect the desired smoothing cut. It is a further object ofthe invention to provide a tool having such characteristics' in asim-ple, eliicient and readily operable device.

My' invention is hereinafter more fully described in connection' with apreferred embodiment thereof illustrated in the drawings, the parteularfeatures thus illustrated being also inol'uded Within my invention asdeiined in the appended' claims.

Iii-the' drawings. Fig. l is a side elevation of my resurfacing toollooking toward the minor' axis of' the elliptical head of' the toolbodyl as preliminarily positioned; in an elliptical handjhole openingthrough' a wall of; a boiler or header Fig. 2 is av bottom plan of thetool; asA shown in Fig. l; Figi. 3' is" an elevation of4 the tool atright angles to Fig. l and showing it in position ready for use, theview being. takenv looking toward the. major axis of. the body head.,and some of the parts being shown. in section; Fig. 4L a detail of.one.. of the. clamping. devices. the plane being indicated by either ofthe lines 4.-5 on Fig.. 3,. in either case the, View being taken lookingoutwardly; Fig. 5. is an axial section through the. tool. showing thebit carrier its` extended position.; Fig'.` is a. cross section.through.' the body oi the tool and the rohi tating spindle in a planenormal to the axis as indicatedby the. line (iA-6. on Fig. 5.; Fig. '7.is= a horizontalv cross senti-on throughthe controlling cam groove. ofthe toolgr as indieate'd by the line 'l--Tr on- Fi-g. 5 lookingdownwardly; Fig. 8. is a sectional View oi the lower` portion oi thedevice corre.- spending` to Fig. 5 but showing. the bit carrierretracted; Fig. 9 is a sectional sideelevation of the lower portion of,the device, showing the bit carrier extended. and rotated from theposition shown in*v Fig.- 5..

In the embodiment o'r the tool shown in' the drawings', the body orframe lill comprises a hollow cylindrical portion N terminating in= ahead l2 having an elliptical contour. This head is slightly smaller thanthefopeing through the material to be' trimmed and carries means,hereinafter described in detail, for properly positioning the head inthe opening and clamping it therein. Brieiiy it may be said that thepositioning is effected: by means on the head temporarily engaging theseat, andtheA clamping by expandable means in the head which engage theWall of the opening.

A cylindrical bore extends through the tubular portion and head. In thisbore is journaled a Spindle 2B', the lower` end of which has an en-Iarged head 2f. A suitable' cutting or trimming bit 3U is carried by`the' head 21| and means herei'nafter described causes the bit to take anorbital course corresponding t'o the shape of the seat to be trimmed.

As shown,l the cutting or trimming bit 30 is rigidly' mounted in a bit.carrier 3|v (hereinafter described in detail) which occupies a diametricpassageway in the head 2l. This bit carrier is shown' as having arectangular exterior contour and as mounted' in a correspondingly shapednotch in" the head 2 I, being retained therein by a bottom p1ate22secured to the` head by screws 23.

Thesplndlewitl the carrier is retained in place' in the frame I bysuitable nuts lill, 4! mounted on a threaded extension 24 of thespindle. As shown, the nut 4D bears against a washer l2 surrounding thespindle and this washer bears against a cap 43 threaded on the upper endof the body l0. The nut 4| acts as a jam nut for the nut 4U.

The spindle is rotatable with the nuts 112, 4| but prevented from axialshifting, the downward thrust being taken by the nut i6 against the cap43 through the interposed washer 42, and the upward thrust being takenby the annular portion 45 of the cap which overhangs an annular shoulderon the spindle adjacent the beginning of the threaded portion. At itsextreme upper end the spindle is formed angularly as shown at 25, forthe application of a suitable crank for rotating the spindle.

It will be seen that if the tool so far described is clamped in properposition in an opening in a member to be trimmed and the spindlerotated, the bit 3U may engage and re-face a marginal surface on theinterior pgovided that the bit is caused to travel to and from the axisof rotation, as such surface varies from being circular.

In Figs. 1, 2, 3 and 5, I have indicated at A a suitable plate or othermember havinga handhole opening a which may be occupied by my tool andhaving on the inner side of such member about the opening a marginalportion a forming a seat which the tool is to trim. If the opening a iselliptical, I cause the tool 30 to move outwardly as it travels towardthe end of the major axis of the ellipse and then to move inwardly as ittravels toward the end of the minor axis. This is one of the features ofmy invention.

To give the in and out travel automatically yto the cutting bitconsequent upon the rotation of the spindle, I provide a controllingcam, having a shape corresponding to the shape of the opening a or theseat a', and a coacting pin, one of which coacting members is mounted onthe spindle and the other on the stationary frame of the tool. In theembodiment shown the cam comprises an elliptical groove l formed in theundersurface o1 the head l2 and the coacting member comprises a pin 32mounted in the bit carrier. The result is that as the spindle is rotatedythe bit travels in an elliptical course corresponding to the a to betrimmed.

I provide manual means for shifting the bitcarrier in or out independentof the cam control described, so that the bit may be fed laterally tocause it to travel gradually across the seat during the trimmingoperation. This same means may, if desired, cause the bit to maire acircuit somewhat diierent from the fixed ellipse provided by the groovel5. The mechanism for effecting this independent shifting of the bitwill now be described.

The bit-carrier 3l is formed with a cylindrical bore 34, closed at theouter end by a removable plug 35 threaded into the bore. Within the boreis a cup-shaped piston 5E) snugly but slidably mounted in the bore. Thispiston has a bore 5l in which is mounted a helical compression spring52. This spring bears at the outer end against an annular head 53screw-threaded into the piston and at the other end against a circularplate 55 threaded on a rod 56, the other end of which is threaded into-the bit-carrier head 35. The piston 50 carries the pin 32 heretoforereferred to, which extends through a slot 36 in the bit carrier into thecam groove I5. The piston 5B has a slotted passageway 58 lthrough itswall which is 4 always in registration with a passageway 38 through theWall of the bit-carrier.

It will be seen from the description given that if fluid under pressureis admitted to the passageway 38 it will pass through the slot 53 intothe piston 50 and thence through the central opening in the annular head53 and act against the carrier head 35. As the position of the piston isdetermined by the engagement of the pin 32 with the wall of the grooveI5, it follows that the fluid pressure will force the bit carrier towardthe right in Fig. 5, for instance, so that it may reach an oppositeextreme position shown in 8, with the bit entirely retracted, or it maytaire an intermediate position dependent upon the relation of the uidpressure to the pressure caused oy the compression spring' 52. In otherwords, the bit is positioned relative to the pin 32 by a balance of thespring pressure and the uid pressure and if the iiuid pressure increasesthe bit moves in one direction and if it decreases it moves in theopposite direction.

To eiTect increase or decrease of the internal iluid pressure, I providethe control device shown in Figs. 1 and 5. As there shown, I havemounted on the frame barrel Il a lateral barrel 60 which has an internalbore 6| communicating by a passageway 62 with an annular passageway 2lformed as a groove about the spindle 20. This annular passageway 21communicates with an axial passageway 28 in the spindle which leads to alower enlargement 29 formed to register at all times with the opening 33in the bit carrier.

Mounted in the bore 6l of the barrel EG is a plunger 64. Oil or othernon-compressible liquid ills the bore in front of this piston, lls thepassageways 62, 2l, 28, 29 in the spindle and the passageways to theinterior of the piston 5B and from suoli interior to the space betweenthe right hand end (Fig. 5) of the piston and the head 35 of the bitcarrier. The result is that if the piston 64 is shoved inwardly theliquid at once transmits motion therefrom to the head 35, moving the bitcarrier toward the right. On the other hand, if the piston 64 is movedoutwardly, the former pressure of the oil against the head is relievedand the spring 52 draws the bit carrier toward the left.

To effect the desired movement of the piston 64 under manual control, Iprovide a cap 6l threaded on the exterior of the barrel 60 and havingthe inner surface of its head acting against the plunger 64. As shown,the head of the cap bears against a plug 68 which is screwed into a borein the plunger 64. The removal of the cap 6'! and the plug 68 allows theoriginal installation of oil in the passageways, this being accomplishedby placing tool in horizontal position and removing bit carrier head 35to allow air to escape from passageways. Then oil poured into the barrel60 lls the bit carrier and the head 35 is replaced and the piston 64 isreplaced, and the plug 68 is installed. The plug 68 is also useful inthat it facilitates re-lling. In use, however, the plug 68 is tight inthe piston 64 and acts as a unit therewith. The exterior of the cap 67is preferably knurled as shown in Fig. l, so that it may be readilygrasped and turned as desired.

In the construction described, if the operator wishes to position thebit nearer the edge of the opening a, the margin of which is beingtrimmed, he merely grasps the knurled cap 6i and screws it on slightly,thus causing the entrained liquid to shove against the bit-carrier head35 and move the bit inwardly. If he wishes the bit to be moved forautomatically moving the bit carrier in and out as the spindle rotates,manual means for adjusting the bit-carrier in and out independent of theautomatic means, and means for adjusting the spindle axially withreference to the frame.

3. The combination of a frame, a rotary spindle mounted." in the frame,a bit-carrier mounted in the spindle and movable in a directiontransverse thereof, a bit carried by the bitcarrier adapted to coactwith a seat about an opening, a piston within the bit-carrier, a pincarried by the piston coacting with a cam on said frame, fluid pressuremeans acting on said piston and bit-carrier to shift the bit-carrierlaterally relative to the spindle, and movable means carried by theframe for Varying the fluid pressure acting on the piston.

4. A tool adapted to trim a seat surrounding an opening in a member,comprising a tubular body adapted to be mounted within the opening, arotary spindle within the body, a head on the spindle, a bit-carriercomprising a hydraulic cylinder transversely movable in the head, a bitcarried by the bit-carrier adapted to coact with the seat surroundingthe opening, a cam on the frame, a piston within the bit-carriercylinder, a pin carried by said piston adapted to coact with the cam, aspring reacting between the piston and bit-carrier and means foradmitting fluid under pressure to the bit-carrier cylinder to act on thebit-carrier inopposition to the spring.

5. A tool comprising in combination a hollow body, a rotary spindlejournaled within the body, a transverse guideway carried by the spindlebeyond the body, a bit-carrier in such guideway, a bit on the carrieradapted to coact with a seat about the opening, said bit carrier beingformed with a cylindrical bore, a piston within the bore, a pin carriedby the piston into engagement with a cam carried by the body, a tubularpassageway in the spindle communicating with said piston, and a deviceon the frame for varying fluid pressure in the passageway.

6. A tool comprising in combination a hollow body, means for clampingthe same in an opening, a rotary spindle journaled within the body, atransverse guideway carried by the spindle beyond the body, abit-carrier in such guideway, an outwardly facing bit on the carrieradapted to coact with a seat about the opening, said bit carrier beingformed with a cylindrical bore, a piston within the bore, a pin carriedby the piston extending movably through the wall of the bitcarrier intoengagement with a cam carried by the body, the tubular passageway in thespindle communicating with said piston, a device carried by the framehaving a passageway in communication with the passageway in the spindleand adapted to contain uid communicating through the spindle passagewaywith the piston in the bit-carrier, a plunger in said device adapted toact on said fluid and a rotatable screw for moving the plunger.

JOI-IN E. GILES.

REFERENCES CITED The following references are of record in the nie ofthis patent:

UNITED STATES PATENTS

